Chen's Island is an island located off the west coast of Ninjago. It served as the hideout of the Anacondrai Cultists and the location of the Tournament of Elements.
Following the Serpentine War, Chen and his disciple Clouse were exiled to the island. While there, Clouse cloaked the island with his Dark Magic and Chen secretly began building up his criminal empire while also starting a chain of noodle houses in Ninjago. Many years later, Chen would launch a second attempt to divide the Elemental Masters, this time through the Tournament of Elements, an event which was held on the island.
After receiving the invitation to compete in the tournament, the ninja entered Chen's ferry along with Garmadon. Upon arriving at the island, the ninja discovered they weren't the only ones with elemental powers. The ninja would compete against the other Elemental Masters throughout the Tournament, before Chen's true plans were unveiled, prompting the competitors to unite and fight him and his army.